/*
 * Copyright 2007 Rob Nielsen
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 * 	http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package com.googlecode.proxymatic.core.handlers.exception;

import com.googlecode.proxymatic.core.ExceptionHandler;

import java.lang.reflect.Constructor;
import java.lang.reflect.Method;

public class WrappedExceptionHandler implements ExceptionHandler {
    private final Class baseWrapperClass;

    public WrappedExceptionHandler() {
        this(RuntimeException.class);
    }

    public WrappedExceptionHandler(Class baseWrapperClass) {
        this.baseWrapperClass = baseWrapperClass;
    }

    public boolean supportsException(Class throwable, Method method) {
        return true;
    }

    public Object handleException(Method method, Throwable throwable) throws Throwable {
        Constructor wrapperConstructor = null;
        Class[] interfaceExceptionTypes = method.getExceptionTypes();
        for (int i = 0; i < interfaceExceptionTypes.length; i++) {
            Class exceptionType = interfaceExceptionTypes[i];
            if (RuntimeException.class.isAssignableFrom(exceptionType)) {
                wrapperConstructor = getConstructor(exceptionType);
                break;
            }
        }
        if (wrapperConstructor == null) {
            wrapperConstructor = getConstructor(baseWrapperClass);
        }
        throw (Throwable) wrapperConstructor.newInstance(throwable);
    }

    private Constructor getConstructor(Class exceptionClass) throws NoSuchMethodException {
        return exceptionClass.getConstructor(Throwable.class);
    }
}
